The correct compound that helps the body generate ATP when starting to exercise is creatine kinase.
Creatine kinase catalyzes the conversion of creatine and ATP to phosphocreatine and adenosine diphosphate (ADP). This reaction is crucial for rapid ATP replenishment during short bursts of intense exercise.
Creatine itself, a compound that can be supplemented, is often utilized in conjunction with creatine kinase to enhance ATP supply during high-intensity activities. However, the specific enzyme involved in this rapid energy production process is creatine kinase.